beyerdynamic A2 Headphone Amplifier Natural and brilliant sound reproduction with an excellent resolution and spatiality.Connectivity Technology: Wired Two parallel headphone outputs for shared listening Convenient remote control for all functions Elegant design with transparent glass cover enabling you to look at the illuminated noble interior Via slide switches for selectable gain and impedance, the A2 can optimally be tuned to connected dynamic headphones (16-600ohms) and to audio sources